net: fec: Use alias for device number

Use the devicetree alias to set the ethernet device number.
Otherwise the second ethernet port has the name eth0 and the first has
the name eth1.

Signed-off-by: Christian Hemp <c.hemp@phytec.de>
Signed-off-by: Christoph Fritz <chf@fritzc.com>
Conflicts:
        drivers/net/ethernet/freescale/fec_main.c
Signed-off-by: Jan Remmet <j.remmet@phytec.de>

Signed-off-by: Yunus Bas <y.bas@phytec.de>
Signed-off-by: Andrej Picej <andrej.picej@norik.com>
Signed-off-by: Stefan Riedmüller <s.riedmueller@phytec.de>

drivers/net/ethernet/freescale/fec_main.c

@@ -4304,6 +4304,7 @@ fec_probe(struct platform_device *pdev)
 	char irq_name[8];
 	int irq_cnt;
 	struct fec_devinfo *dev_info;
+	int eth_id;
 
 	fec_enet_get_queue_num(pdev, &num_tx_qs, &num_rx_qs);
 
@@ -4513,6 +4514,10 @@ fec_probe(struct platform_device *pdev)
 	pinctrl_pm_select_sleep_state(&pdev->dev);
 
 	ndev->max_mtu = PKT_MAXBUF_SIZE - ETH_HLEN - ETH_FCS_LEN;
+	eth_id = of_alias_get_id(pdev->dev.of_node, "ethernet");
+
+	if (eth_id >= 0)
+		sprintf(ndev->name, "eth%d", eth_id);
 
 	ret = register_netdev(ndev);
 	if (ret)